Compress PDF Online

Reduce PDF file size with PDF.it. Compress PDFs for faster sharing, easier uploads, and smaller email attachments — quick and browser-based.

Smart Compression
Files Deleted After Session
No Login Required

Use PDF.it's Compress PDF tool to reduce PDF file size in seconds. Perfect for email attachments, upload limits, and faster sharing — upload your PDF, compress it, and download a smaller file instantly.

  • ✓ Reduce PDF size quickly for email and uploads
  • ✓ Keep PDFs readable after compression
  • ✓ Works on Mac, Windows, iOS, Android, and Linux
  • ✓ No installation — compress PDFs in your browser

Drop your files here

or click to browse files

Supported formats: .pdf

SECURE PROCESSING
Your file is protected during conversion
ENCRYPTED UPLOADS
Encrypted transfer (TLS/HTTPS)
AUTO-DELETE
Files are removed after processing
BROWSER-BASED
No installs — works in your browser

Reduce PDF File Size for Email

Many services cap attachment sizes. PDF.it helps shrink PDFs so they're easier to send and upload without splitting.

Compress Scanned & Image-Heavy PDFs

Scans and photo-based PDFs can be huge. PDF compression reduces image data to create a smaller file while keeping pages usable.

Fast Online Compression

Upload, compress, download. No software required — PDF.it runs directly in your browser on any device.

How to Compress a PDF

1

Upload your PDF

Drag and drop or click to choose a file

2

Choose compression level

Light, Medium, or Extreme reduction

3

Download your PDF

Get your compressed file instantly

Frequently Asked Questions

How do I compress a PDF with PDF.it?

Upload your PDF, click Compress PDF, then download the smaller file.

Will compressing a PDF reduce quality?

Compression can reduce file size by optimizing images and data. Text usually remains readable, but image-heavy PDFs may lose some detail depending on compression level.

Why is my PDF still large after compression?

If the PDF is already optimized or contains high-resolution images, the size may not drop much. Try splitting the PDF into smaller parts.

Can PDF.it compress scanned PDFs?

Yes — scanned PDFs are often the best candidates for compression because they contain large embedded images.

Can I compress a PDF on my phone?

Yes. PDF.it works in mobile browsers — upload, compress, and download directly on iPhone or Android.

What is the maximum PDF size I can compress?

Free accounts can upload files up to 25MB. Pro and Business accounts can upload up to 200MB.